IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.167.32.128/25

network10.167.32.128/25

broadcast10.167.32.255

first host10.167.32.129

last host10.167.32.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.32.128/25

address00001010.10100111.00100000.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.00100000.10000000

broadcast00001010.10100111.00100000.11111111

green = network part, grey = host part

hex0x0aa72080

decimal178724992

reverse dns128.32.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:2080

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.32.128/32	10.167.32.128 – 10.167.32.128	10.167.32.128
2	10.167.32.129/32	10.167.32.129 – 10.167.32.129	10.167.32.129
3	10.167.32.130/32	10.167.32.130 – 10.167.32.130	10.167.32.130
4	10.167.32.131/32	10.167.32.131 – 10.167.32.131	10.167.32.131
5	10.167.32.132/32	10.167.32.132 – 10.167.32.132	10.167.32.132
6	10.167.32.133/32	10.167.32.133 – 10.167.32.133	10.167.32.133
7	10.167.32.134/32	10.167.32.134 – 10.167.32.134	10.167.32.134
8	10.167.32.135/32	10.167.32.135 – 10.167.32.135	10.167.32.135
9	10.167.32.136/32	10.167.32.136 – 10.167.32.136	10.167.32.136
10	10.167.32.137/32	10.167.32.137 – 10.167.32.137	10.167.32.137
11	10.167.32.138/32	10.167.32.138 – 10.167.32.138	10.167.32.138
12	10.167.32.139/32	10.167.32.139 – 10.167.32.139	10.167.32.139
13	10.167.32.140/32	10.167.32.140 – 10.167.32.140	10.167.32.140
14	10.167.32.141/32	10.167.32.141 – 10.167.32.141	10.167.32.141
15	10.167.32.142/32	10.167.32.142 – 10.167.32.142	10.167.32.142
16	10.167.32.143/32	10.167.32.143 – 10.167.32.143	10.167.32.143
17	10.167.32.144/32	10.167.32.144 – 10.167.32.144	10.167.32.144
18	10.167.32.145/32	10.167.32.145 – 10.167.32.145	10.167.32.145
19	10.167.32.146/32	10.167.32.146 – 10.167.32.146	10.167.32.146
20	10.167.32.147/32	10.167.32.147 – 10.167.32.147	10.167.32.147
21	10.167.32.148/32	10.167.32.148 – 10.167.32.148	10.167.32.148
22	10.167.32.149/32	10.167.32.149 – 10.167.32.149	10.167.32.149
23	10.167.32.150/32	10.167.32.150 – 10.167.32.150	10.167.32.150
24	10.167.32.151/32	10.167.32.151 – 10.167.32.151	10.167.32.151
25	10.167.32.152/32	10.167.32.152 – 10.167.32.152	10.167.32.152
26	10.167.32.153/32	10.167.32.153 – 10.167.32.153	10.167.32.153
27	10.167.32.154/32	10.167.32.154 – 10.167.32.154	10.167.32.154
28	10.167.32.155/32	10.167.32.155 – 10.167.32.155	10.167.32.155
29	10.167.32.156/32	10.167.32.156 – 10.167.32.156	10.167.32.156
30	10.167.32.157/32	10.167.32.157 – 10.167.32.157	10.167.32.157
31	10.167.32.158/32	10.167.32.158 – 10.167.32.158	10.167.32.158
32	10.167.32.159/32	10.167.32.159 – 10.167.32.159	10.167.32.159
33	10.167.32.160/32	10.167.32.160 – 10.167.32.160	10.167.32.160
34	10.167.32.161/32	10.167.32.161 – 10.167.32.161	10.167.32.161
35	10.167.32.162/32	10.167.32.162 – 10.167.32.162	10.167.32.162
36	10.167.32.163/32	10.167.32.163 – 10.167.32.163	10.167.32.163
37	10.167.32.164/32	10.167.32.164 – 10.167.32.164	10.167.32.164
38	10.167.32.165/32	10.167.32.165 – 10.167.32.165	10.167.32.165
39	10.167.32.166/32	10.167.32.166 – 10.167.32.166	10.167.32.166
40	10.167.32.167/32	10.167.32.167 – 10.167.32.167	10.167.32.167
41	10.167.32.168/32	10.167.32.168 – 10.167.32.168	10.167.32.168
42	10.167.32.169/32	10.167.32.169 – 10.167.32.169	10.167.32.169
43	10.167.32.170/32	10.167.32.170 – 10.167.32.170	10.167.32.170
44	10.167.32.171/32	10.167.32.171 – 10.167.32.171	10.167.32.171
45	10.167.32.172/32	10.167.32.172 – 10.167.32.172	10.167.32.172
46	10.167.32.173/32	10.167.32.173 – 10.167.32.173	10.167.32.173
47	10.167.32.174/32	10.167.32.174 – 10.167.32.174	10.167.32.174
48	10.167.32.175/32	10.167.32.175 – 10.167.32.175	10.167.32.175
49	10.167.32.176/32	10.167.32.176 – 10.167.32.176	10.167.32.176
50	10.167.32.177/32	10.167.32.177 – 10.167.32.177	10.167.32.177
51	10.167.32.178/32	10.167.32.178 – 10.167.32.178	10.167.32.178
52	10.167.32.179/32	10.167.32.179 – 10.167.32.179	10.167.32.179
53	10.167.32.180/32	10.167.32.180 – 10.167.32.180	10.167.32.180
54	10.167.32.181/32	10.167.32.181 – 10.167.32.181	10.167.32.181
55	10.167.32.182/32	10.167.32.182 – 10.167.32.182	10.167.32.182
56	10.167.32.183/32	10.167.32.183 – 10.167.32.183	10.167.32.183
57	10.167.32.184/32	10.167.32.184 – 10.167.32.184	10.167.32.184
58	10.167.32.185/32	10.167.32.185 – 10.167.32.185	10.167.32.185
59	10.167.32.186/32	10.167.32.186 – 10.167.32.186	10.167.32.186
60	10.167.32.187/32	10.167.32.187 – 10.167.32.187	10.167.32.187
61	10.167.32.188/32	10.167.32.188 – 10.167.32.188	10.167.32.188
62	10.167.32.189/32	10.167.32.189 – 10.167.32.189	10.167.32.189
63	10.167.32.190/32	10.167.32.190 – 10.167.32.190	10.167.32.190
64	10.167.32.191/32	10.167.32.191 – 10.167.32.191	10.167.32.191
65	10.167.32.192/32	10.167.32.192 – 10.167.32.192	10.167.32.192
66	10.167.32.193/32	10.167.32.193 – 10.167.32.193	10.167.32.193
67	10.167.32.194/32	10.167.32.194 – 10.167.32.194	10.167.32.194
68	10.167.32.195/32	10.167.32.195 – 10.167.32.195	10.167.32.195
69	10.167.32.196/32	10.167.32.196 – 10.167.32.196	10.167.32.196
70	10.167.32.197/32	10.167.32.197 – 10.167.32.197	10.167.32.197
71	10.167.32.198/32	10.167.32.198 – 10.167.32.198	10.167.32.198
72	10.167.32.199/32	10.167.32.199 – 10.167.32.199	10.167.32.199
73	10.167.32.200/32	10.167.32.200 – 10.167.32.200	10.167.32.200
74	10.167.32.201/32	10.167.32.201 – 10.167.32.201	10.167.32.201
75	10.167.32.202/32	10.167.32.202 – 10.167.32.202	10.167.32.202
76	10.167.32.203/32	10.167.32.203 – 10.167.32.203	10.167.32.203
77	10.167.32.204/32	10.167.32.204 – 10.167.32.204	10.167.32.204
78	10.167.32.205/32	10.167.32.205 – 10.167.32.205	10.167.32.205
79	10.167.32.206/32	10.167.32.206 – 10.167.32.206	10.167.32.206
80	10.167.32.207/32	10.167.32.207 – 10.167.32.207	10.167.32.207
81	10.167.32.208/32	10.167.32.208 – 10.167.32.208	10.167.32.208
82	10.167.32.209/32	10.167.32.209 – 10.167.32.209	10.167.32.209
83	10.167.32.210/32	10.167.32.210 – 10.167.32.210	10.167.32.210
84	10.167.32.211/32	10.167.32.211 – 10.167.32.211	10.167.32.211
85	10.167.32.212/32	10.167.32.212 – 10.167.32.212	10.167.32.212
86	10.167.32.213/32	10.167.32.213 – 10.167.32.213	10.167.32.213
87	10.167.32.214/32	10.167.32.214 – 10.167.32.214	10.167.32.214
88	10.167.32.215/32	10.167.32.215 – 10.167.32.215	10.167.32.215
89	10.167.32.216/32	10.167.32.216 – 10.167.32.216	10.167.32.216
90	10.167.32.217/32	10.167.32.217 – 10.167.32.217	10.167.32.217
91	10.167.32.218/32	10.167.32.218 – 10.167.32.218	10.167.32.218
92	10.167.32.219/32	10.167.32.219 – 10.167.32.219	10.167.32.219
93	10.167.32.220/32	10.167.32.220 – 10.167.32.220	10.167.32.220
94	10.167.32.221/32	10.167.32.221 – 10.167.32.221	10.167.32.221
95	10.167.32.222/32	10.167.32.222 – 10.167.32.222	10.167.32.222
96	10.167.32.223/32	10.167.32.223 – 10.167.32.223	10.167.32.223
97	10.167.32.224/32	10.167.32.224 – 10.167.32.224	10.167.32.224
98	10.167.32.225/32	10.167.32.225 – 10.167.32.225	10.167.32.225
99	10.167.32.226/32	10.167.32.226 – 10.167.32.226	10.167.32.226
100	10.167.32.227/32	10.167.32.227 – 10.167.32.227	10.167.32.227
101	10.167.32.228/32	10.167.32.228 – 10.167.32.228	10.167.32.228
102	10.167.32.229/32	10.167.32.229 – 10.167.32.229	10.167.32.229
103	10.167.32.230/32	10.167.32.230 – 10.167.32.230	10.167.32.230
104	10.167.32.231/32	10.167.32.231 – 10.167.32.231	10.167.32.231
105	10.167.32.232/32	10.167.32.232 – 10.167.32.232	10.167.32.232
106	10.167.32.233/32	10.167.32.233 – 10.167.32.233	10.167.32.233
107	10.167.32.234/32	10.167.32.234 – 10.167.32.234	10.167.32.234
108	10.167.32.235/32	10.167.32.235 – 10.167.32.235	10.167.32.235
109	10.167.32.236/32	10.167.32.236 – 10.167.32.236	10.167.32.236
110	10.167.32.237/32	10.167.32.237 – 10.167.32.237	10.167.32.237
111	10.167.32.238/32	10.167.32.238 – 10.167.32.238	10.167.32.238
112	10.167.32.239/32	10.167.32.239 – 10.167.32.239	10.167.32.239
113	10.167.32.240/32	10.167.32.240 – 10.167.32.240	10.167.32.240
114	10.167.32.241/32	10.167.32.241 – 10.167.32.241	10.167.32.241
115	10.167.32.242/32	10.167.32.242 – 10.167.32.242	10.167.32.242
116	10.167.32.243/32	10.167.32.243 – 10.167.32.243	10.167.32.243
117	10.167.32.244/32	10.167.32.244 – 10.167.32.244	10.167.32.244
118	10.167.32.245/32	10.167.32.245 – 10.167.32.245	10.167.32.245
119	10.167.32.246/32	10.167.32.246 – 10.167.32.246	10.167.32.246
120	10.167.32.247/32	10.167.32.247 – 10.167.32.247	10.167.32.247
121	10.167.32.248/32	10.167.32.248 – 10.167.32.248	10.167.32.248
122	10.167.32.249/32	10.167.32.249 – 10.167.32.249	10.167.32.249
123	10.167.32.250/32	10.167.32.250 – 10.167.32.250	10.167.32.250
124	10.167.32.251/32	10.167.32.251 – 10.167.32.251	10.167.32.251
125	10.167.32.252/32	10.167.32.252 – 10.167.32.252	10.167.32.252
126	10.167.32.253/32	10.167.32.253 – 10.167.32.253	10.167.32.253
127	10.167.32.254/32	10.167.32.254 – 10.167.32.254	10.167.32.254
128	10.167.32.255/32	10.167.32.255 – 10.167.32.255	10.167.32.255

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /25
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	-
/25	255.255.255.128	128	126	1
/26	255.255.255.192	64	62	2 split →
/27	255.255.255.224	32	30	4 split →
/28	255.255.255.240	16	14	8 split →
/29	255.255.255.248	8	6	16 split →
/30	255.255.255.252	4	2	32 split →
/31	255.255.255.254	2	2	64 split →
/32	255.255.255.255	1	1	128 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →